Response to My Hayward SP1592 pump says this SP1500UNPAK2 is an optional union connector. The outside threads of the pump's inlet measures 2-3/4" dia., and the inlet's inside threads about 1-7/8" dia. Does the threaded male portion or threaded female portion of this union connector connect to the pump's inlet? I want to connect 2" PVC pipe to the pump's inlet, and looking for a fitting to screw onto the outside threads of the pump's inlet. Thank you.

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